US5343059A - Method and apparatus for reducing blooming in output of a CCD image sensor - Google Patents

Method and apparatus for reducing blooming in output of a CCD image sensor Download PDF

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Publication number
US5343059A
US5343059A US08/038,470 US3847093A US5343059A US 5343059 A US5343059 A US 5343059A US 3847093 A US3847093 A US 3847093A US 5343059 A US5343059 A US 5343059A
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Prior art keywords
ccd
read
toggling
image sensor
charge
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US08/038,470
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English (en)
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George M. Blaszczynski
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Leaf Systems Inc
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Leaf Systems Inc
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Assigned to LEAF SYSTEMS, INC. reassignment LEAF SYSTEMS, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BLASZCZYNSKI, GEORGE M.
Priority to EP94104490A priority patent/EP0618720A3/en
Priority to JP6061014A priority patent/JPH06326137A/ja
Priority to US08/296,515 priority patent/US5696393A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
    • H04N25/62—Detection or reduction of noise due to excess charges produced by the exposure, e.g. smear, blooming, ghost image, crosstalk or leakage between pixels
    • H04N25/621—Detection or reduction of noise due to excess charges produced by the exposure, e.g. smear, blooming, ghost image, crosstalk or leakage between pixels for the control of blooming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/70—SSIS architectures; Circuits associated therewith
    • H04N25/71—Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors

Definitions

  • the present invention relates to apparatus and methods for operating charge coupled device (CCD) image sensors generally and to methods of implementing anti-blooming in particular.
  • CCD charge coupled device
  • the image sensors smear bright spots, in a process known as "blooming".
  • the excessive illumination at the bright spots causes a local excessive generation of image charge in a few elements of the CCD image sensor.
  • the excessive generation often spreads to neighboring, less illuminated and less charged CCD elements, which spreading of charge results in blooming.
  • a method for reducing bloom in output of a charge coupled device (CCD) image sensor including the step of toggling at least two phases of the CCD after exposure of the CCD.
  • CCD charge coupled device
  • a flash of light occurs during the exposure.
  • the step of toggling continues until an amount of charge stored in each element of the CCD is at a desired level.
  • the method includes the step of reading out data stored in the CCD after the step of toggling has concluded, wherein the step of reading out is performed in accordance with a desired read-out mode and wherein the desired level is generally close to the full well level associated with the read-out mode.
  • the read-out mode can be the multi-phased pinned (MPP) mode or, alternatively, the buried channel mode.
  • the step of toggling is performed with first high and low voltages
  • the step of reading charge out is performed with second high and low voltages and the first high voltage may be different from the second high voltage.
  • the step of toggling is performed with high and low voltages and wherein the desired level is affected by changing the high voltage.
  • the step of toggling at least two phases of the CCD during exposure is performed.
  • apparatus for reducing bloom in output of a CCD image sensor including a CCD toggler for toggling at least two phases of the CCD after exposure of the CCD.
  • the apparatus performs the steps of the method described hereinabove.
  • FIG. 1 is a schematic illustration of one element of a CCD array
  • FIG. 2 is a graphical illustration of the amount of charge stored in the CCD element of FIG. 1 during a data cycle
  • FIG. 3 is a timing diagram illustration for toggling of the phases of the CCD element of FIG. 1, in accordance with a preferred embodiment of the present invention.
  • FIGS. 1-3 are useful in understanding the anti-blooming method of the present invention.
  • FIG. 1 illustrates one element of a CCD image sensor array, such as the CCD 442 manufactured by Loral Fairchild Imaging Sensors, Milipitas, Calif., U.S.A..
  • the element typically has three phases 10-14 formed by three gate structures. Each phase 10-14 is separately controlled by a corresponding signal, V1, V2 or V3, as shown in FIG. 1.
  • FIG. 2 graphs the charge level during and after a flash exposure for areas exposed to excessive brightness. It is noted that the flash produces in the CCD elements a charge level Q significantly in excess of a buried channel full well charge level, yet this charge generally does not bloom. Significant blooming would occur if this charge were to be shifted as is necessary during read-out.
  • the signals V1 and V2 are toggled after the flash exposure, during a "dissipation" period, as noted in FIG. 2.
  • the signals can optionally also be toggled during exposure.
  • the exact shape of the charge accumulation and dissipation curve is currently undetermined and thus, the curve given in FIG. 2 is an approximation only.
  • Typical timing diagrams for the signals V1-V3 during toggling are shown in FIG. 3. It is noted that signals V1 and V2 vary between high and low voltage levels, VH and VL, and that, generally, V1 is high when V2 is low and vice versa. V3 is typically kept at the VL voltage level. The VH and VL for the three different phases may all be different.
  • the exposure interval is much shorter than the read-out interval and it may be desirable to operate the CCD image sensor in the multi-phased pinned (MPP) mode during image read-out.
  • MPP multi-phased pinned
  • the charge must be dissipated to the level of the MPP full well before the MPP readout begins. This can be done by increasing the high voltage VH during the dissipation period.
  • VH is set to the level which results in the buried channel full well being approximately equal to the MPP full well. For example, for the CCD 442, VH of +9V prevents blooming with MPP read-out.
  • the length of the dissipation period is typically experimentally determined by overexposing the CCD image sensor with a constant, predetermined amount of light, typically during a flash exposure, and toggling for a variable length of time after the exposure.
  • the length of time which ensures that the charge remaining after toggling does not bloom is the desired length of the dissipation period.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Solid State Image Pick-Up Elements (AREA)
US08/038,470 1993-03-30 1993-03-30 Method and apparatus for reducing blooming in output of a CCD image sensor Expired - Fee Related US5343059A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US08/038,470 US5343059A (en) 1993-03-30 1993-03-30 Method and apparatus for reducing blooming in output of a CCD image sensor
EP94104490A EP0618720A3 (en) 1993-03-30 1994-03-22 Method and device for reducing glare at the output of a D.T.C.
JP6061014A JPH06326137A (ja) 1993-03-30 1994-03-30 Ｃｃｄイメージセンサの出力におけるブルーミング削減方法及び装置
US08/296,515 US5696393A (en) 1993-03-30 1994-08-26 Method and apparatus for reducing blooming in output of a CCD image sensor

Applications Claiming Priority (1)

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US08/038,470 US5343059A (en) 1993-03-30 1993-03-30 Method and apparatus for reducing blooming in output of a CCD image sensor

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US08/296,515 Expired - Fee Related US5696393A (en) 1993-03-30 1994-08-26 Method and apparatus for reducing blooming in output of a CCD image sensor

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5696393A (en) * 1993-03-30 1997-12-09 Leaf Systems, Inc. Method and apparatus for reducing blooming in output of a CCD image sensor
US7084915B1 (en) * 1999-05-28 2006-08-01 Pentax Corporation Apparatus for driving an image device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6188433B1 (en) 1999-02-02 2001-02-13 Ball Aerospace & Technologies Corp. Method and apparatus for enhancing the dynamic range of a CCD sensor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4302779A (en) * 1979-06-06 1981-11-24 Nippon Electric Co., Ltd. Methods of reducing blooming in the drive of charge-coupled image sensors
US4328432A (en) * 1978-07-26 1982-05-04 Sony Corporation Anti-blooming charge transfer device
JPS61219271A (ja) * 1985-03-25 1986-09-29 Nippon Kogaku Kk <Nikon> インタ−ライン転送型ｃｃｄの駆動方法
US4679212A (en) * 1984-07-31 1987-07-07 Texas Instruments Incorporated Method and apparatus for using surface trap recombination in solid state imaging devices
US4694476A (en) * 1984-06-06 1987-09-15 Nec Corporation Buried channel charge coupled device
US5122850A (en) * 1989-09-05 1992-06-16 Eastman Kodak Company Blooming control and reduced image lag in interline transfer CCD area image sensors

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5343059A (en) * 1993-03-30 1994-08-30 Leaf Systems, Inc. Method and apparatus for reducing blooming in output of a CCD image sensor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4328432A (en) * 1978-07-26 1982-05-04 Sony Corporation Anti-blooming charge transfer device
US4302779A (en) * 1979-06-06 1981-11-24 Nippon Electric Co., Ltd. Methods of reducing blooming in the drive of charge-coupled image sensors
US4694476A (en) * 1984-06-06 1987-09-15 Nec Corporation Buried channel charge coupled device
US4679212A (en) * 1984-07-31 1987-07-07 Texas Instruments Incorporated Method and apparatus for using surface trap recombination in solid state imaging devices
JPS61219271A (ja) * 1985-03-25 1986-09-29 Nippon Kogaku Kk <Nikon> インタ−ライン転送型ｃｃｄの駆動方法
US5122850A (en) * 1989-09-05 1992-06-16 Eastman Kodak Company Blooming control and reduced image lag in interline transfer CCD area image sensors

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
"Electronic Components and Circuits", NASA's Jet Propulsion Laboratory, Pasadena, California, NASA Tech Briefs, Jul. 1992, pp. 20, 22, 28.
Electronic Components and Circuits , NASA s Jet Propulsion Laboratory, Pasadena, California, NASA Tech Briefs, Jul. 1992, pp. 20, 22, 28. *
Furukawa et al., "An Interline Transfer CCD For A Single Sensor 2/3 Color Comera," Conference: International Electron Devices Meeting Technical Digest, Washington, D.C., U.S.A., Dec. 8-10, 1980 pp. 346-349.
Furukawa et al., An Interline Transfer CCD For A Single Sensor Color Comera, Conference: International Electron Devices Meeting Technical Digest, Washington, D.C., U.S.A., Dec. 8 10, 1980 pp. 346 349. *
Heyns et al., "The Resistive Gate CTD Area-Image Sensor; "IEEE Transactions on Electron Devices, vol. ED-25, No. 2, Feb. 1978, pp. 135-139.
Heyns et al., The Resistive Gate CTD Area Image Sensor; IEEE Transactions on Electron Devices, vol. ED 25, No. 2, Feb. 1978, pp. 135 139. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5696393A (en) * 1993-03-30 1997-12-09 Leaf Systems, Inc. Method and apparatus for reducing blooming in output of a CCD image sensor
US7084915B1 (en) * 1999-05-28 2006-08-01 Pentax Corporation Apparatus for driving an image device

Also Published As

Publication number Publication date
EP0618720A3 (en) 1997-03-12
US5696393A (en) 1997-12-09
JPH06326137A (ja) 1994-11-25
EP0618720A2 (en) 1994-10-05

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